Vulcan Haestus commands Freeze Force as its Colonel, leading this specialized military and police unit against Burnish-related crimes. He wields his considerable authority aggressively, often exceeding its bounds to pursue his goals. His imposing presence stems from an elaborate animatronic suit, grey-plated with green and white segments, an orange visor, and striped detailing on the right arm. This armor deliberately masks his true diminutive and frail physique, which leaves him noticeably shorter than peers when unarmored. Haestus exhibits a brutish, haughty, and abrasive personality defined by cruelty and overcompensation for deep-seated insecurities. He openly relishes inflicting misery, particularly through the public brutalization of Burnish individuals, whom he dehumanizes as mere fuel sources. His apparent loyalty to Governor Kray Foresight is self-serving, motivated by personal gain. His sadism manifests in acts like laughing at the shattering of frozen Burnish victims. His background involves key events: before the main narrative, he tracked and captured Burnish using Freeze Force ice weaponry for imprisonment. In "Lio-hen," he captured numerous Burnish during a raid, anticipating escape tactics, and later captured Lio Fotia’s generals Gueira and Meis before Lio rescued them. During a pizzeria incident, he arrested a Burnish employee without criminal activity and detained the owner for employing them, threatening Galo Thymos with arrest until Ignis Ex intervened. He facilitated Kray’s plan to use captured Burnish as living fuel for a warp engine, knowing it would cause planetary destruction. To this end, he implanted a tracker in an elderly Burnish man, promising safety for betraying Lio’s location, then callously betrayed and froze the informant after the trap succeeded at Fennel Volcano. After Lio’s prison break, he attempted to capture Heris Ardebit for destroying the promatech engine and engaged in direct combat with Burning Rescue during the final conflict. In the climax, encountering teal flames caused him to abandon his mech suit, revealing his small, unarmored form; his defeat culminated in a brief moment of screaming before he was last seen without armor, expressing disappointment. His relationships are transactional and antagonistic: he maintained an alliance with Kray Foresight, rounding up Burnish for experiments in exchange for advanced weaponry. He held intense animosity toward Lio Fotia, whom he considered a persistent nuisance, and Ignis Ex, with whom he shared a history of conflict marked by confrontations inspired by action film dynamics. He displayed consistent contempt for Burning Rescue, dismissing their technology and authority while actively obstructing their efforts to protect Burnish civilians. Early concept art depicted a slimmer mech design and potential head tattoos. An abandoned story draft featured him fighting Lio during a prison escape without prior knowledge of Lio’s plans. Another discarded ending involved his arrest alongside Kray. His name derives from Vulcan, the Roman god of fire and forging, and "Haestus," a shortening of Hephaestus, reflecting thematic ties to weaponry and fire.